The Kingdom of León declares war on Bulgaria for trying to use the Bubonic plague as a weapon (on other Christians, no less). I'd urge anyone else to as well, or else it'll just force war to devolve into 'I send a dozen [bleep] with the Black Lion into your camp to make you all senile'. Yeah, that's why the Protestant reformation wasn't a big deal to the Catholic church, right? Or Islam? Because, they all worshipped God so it was no big deal.